671721374 has 16 divisors (see below), whose sum is σ = 1103641200. Its totient is φ = 305203584.

The previous prime is 671721331. The next prime is 671721377. The reversal of 671721374 is 473127176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671721377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339644 + ... + 341615.

It is an arithmetic number, because the mean of its divisors is an integer number (68977575).

Almost surely, 2^671721374 is an apocalyptic number.

671721374 is a deficient number, since it is larger than the sum of its proper divisors (431919826).

671721374 is a wasteful number, since it uses less digits than its factorization.

671721374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681307.

The product of its digits is 49392, while the sum is 38.

The square root of 671721374 is about 25917.5881208109. The cubic root of 671721374 is about 875.7827549036.

The spelling of 671721374 in words is "six hundred seventy-one million, seven hundred twenty-one thousand, three hundred seventy-four".